Answers to the questions: My 3-year old child has abdominal distention every day. He starts the day with a flat belly, but each time he eats it gets bigger until the evening, when it sticks way out. He feels so full that he doesn't eat a good dinner. He has terrible gas all night long. We hear the gas passing when we walk by his room as he sleeps. What can we do to help our child?" Revised and updated 2009.